Em tham khảo nha:
\(\begin{array}{l}
2NaCl \to 2Na + C{l_2}\\
2Na + C{l_2} \to 2NaCl\\
A:NaCl\\
{A_1}:Na\\
{B_1}:C{l_2}\\
4Na + {O_2} \to 2N{a_2}O\\
{A_2}:N{a_2}O\\
C{l_2} + {H_2} \to 2HCl\\
{B_2}:HCl\\
N{a_2}O + 2HCl \to 2NaCl + {H_2}O\\
N{a_2}O + {H_2}O \to 2NaOH\\
{A_3}:NaOH\\
Fe + 2HCl \to FeC{l_2} + {H_2}\\
{B_3}:FeC{l_2}\\
2NaOH + FeC{l_2} \to Fe{(OH)_2} + 2NaCl\\
2NaOH + {H_2}S{O_4} \to N{a_2}S{O_4} + 2{H_2}O\\
{A_4}:N{a_2}S{O_4}\\
FeC{l_2} + Ba{(OH)_2} \to Fe{(OH)_2} + BaC{l_2}\\
{B_4}:BaC{l_2}\\
N{a_2}S{O_4} + BaC{l_2} \to 2NaCl + BaS{O_4}
\end{array}\)
